JKowalski33
spending too much on rocks
Member since August 2004
Posts: 451
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Post by JKowalski33 on Aug 9, 2004 22:32:11 GMT -5
Hi everybody. I still havn't bought my supplies and still am researching before I do. While I have been looking around different sites, I see grit like 60/90, 120/220, and then I see grit like 80, 220 and it says it is graded. I have read for example that both the 80 and 60/90 are for the 1st grind and then next is 120/220 or 220 for second grind. What is the difference between the grits with one number and the grits with two numbers? And why is some grit graded? -Jackson
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RedwoodRocks
freely admits to licking rocks
Member since March 2003
Posts: 762
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Post by RedwoodRocks on Aug 9, 2004 22:49:59 GMT -5
Hi Jackson,
The straight grits tend to be more expensive than the split grits. I think the straight grits are more suited for lapping the rocks. While the split grits work just fine for the tumblers.
The straight grit will have more grit the same size while the split grit has a wider range in the grit size. I would guess that the straight grits require more effort to size, thus the higher price.
Cal
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JKowalski33
spending too much on rocks
Member since August 2004
Posts: 451
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Post by JKowalski33 on Aug 9, 2004 23:45:07 GMT -5
Hi Cal So you say that for tumbling they both work fine? I guess I will get the cheaper one then. Thanks for the info! -Jackson
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Post by mrbrett on Aug 10, 2004 7:17:18 GMT -5
I use the mix grit and it does a good job. If you are looking for grit at a super place look in the good ,bad , and the ugly site and scroll down till you see the post on Miles Supply. There are a few of us that have bought from them and there grit prices can't be beat. The only kicker is that you have to buy 50# . But you will find out soon enough that it won't take you long to go through that. But if you want to get enough to last just a while the rock shed has what you need.
Brett
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Post by connrock on Aug 11, 2004 20:36:20 GMT -5
Hi Jackson,,,, Graded grit is just that,,,,it is consists of only 220 grit Ungraded grit IS just that,,,, 120/220 grit is grit with a range of sizes from 120 to 220. Tom
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JKowalski33
spending too much on rocks
Member since August 2004
Posts: 451
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Post by JKowalski33 on Aug 12, 2004 0:41:11 GMT -5
Yeah I dont think I will be needing 50 lbs of grit to start off with. I finally won a tumbler off ebay. Here is the link to it cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4843&item=2261319745&rd=1I got some ungraded grit from the rockshed. 3 lbs of 60/90, 1 of 120/220, 1 of 500, 1 of tripoli, 1/2 lb cerium oxide and 2 lbs plastic pellets. I also got a bit of rough rock. A pound of each: sodalite, petrified wood, prairie agate and blue jasper. I also have some random rocks I have been finding here and there that I think could have some potential of looking cool. I can't wait to get started! ;D -Jackson
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Post by mrbrett on Aug 12, 2004 7:24:02 GMT -5
You might not want to tumble them all together. The sodalite is alot softer than the pet.wood. If you havent allready find a book on the mohs hardness of different agates. The libary is a good start. This will help you keep the hardness the same. Good luck and enjoy!
Brett
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